Ladle



938. R. s. A. DOUGHERTY 2,135,558

LADLE Filed Feb. 26, 1938 2 -.SheetsSheet l Nov. 8, 1938. R. s. A.DOUGHER'TY' 2,135,658

LADLE Filed Feb. 26, 1952 2 Sheets-Sheet 2 Patented Nov. 8, 1938 UNITEDSTATES L'ADLE Robert S. A. Daugherty, Bethlehem,Pa., assignor toBethlehem Steel Company, a corporation of Pennsylvania ApplicationFebruary 26, 1938,'-Serial No. 192,696

a Claims.

My invention relates to slag pots used for conveying molten slag from afurnace to a slag dump, and particularly to an improved construction ofsuch pots. I

" Slag pots in general are made in the shape of an inverted thimble,with outwardly flaring sides and a rounded bottom. Such pots aregenerally equipped with a plurality of seats intermediate the top andbottom of the pot by which they may be mounted on a yoke provided withtrunnions which provide a pivot on which the slag pot may be tippedwhile resting on suitable supports on a slag car.

In service, the high temperatures to which slag pots are subjected causestresses in the walls of the pots and eventually cause the walls tocrack and thereafter to deteriorate rapidly.

In addition, these high temperatures cause the walls of the pot toexpand, particularly in the region immediately below thesupporting'yoke. As long as such expansion is not excessive, no harmoccurs, but in practice the walls of the pot are frequently strainedbeyond their elastic limit and acquire a permanent bulge or set. Whenslag is handled and dumped from such a pot in a molten condition no harmresults from the pressure of a bulge in the side walls. However, slag isfrequently kept in the pots for a period of several hours and inrsuchcase the body of slag in immediate contact with the walls of the potcools and forms a layer of solidified slag known as a skull. If a skullis formed in a pot, the sides of which .are bulged as above described,the constriction of the pot above the bulge prevents the 5 removal ofthe skull by merely tipping the pot, and it is necessary to break up theskull with sledges or orowbars before it can be removed from the pot.

The object of my invention is to provide a slag pot so constructed thatcracking, which causes the pot to deteriorate rapidly, and bulging,which makes the skull difiicult to remove, are eliminated.

Other objects of my invention will be apparent from the drawings andfrom the following description.

In the drawings:

Figure 1 is a top plan view of a slag pot constructed in accordance withmy invention;

Fig. 2 is a View partly in vertical elevation and partly in verticalsection along the line 2--2 of the slag pot shown in Fig. 1;

Figs. 3 and 4 are views in horizontal section of the slag pot takenalong the lines 3--3 and 4-4 of Fig. 2, respectively; and

Fig. 5 is a fragmentary View in vertical section of a slag pot along theline 5-5 of Fig. 1 showing a seat which rests upon the yoke.

In the drawings, which show a slag pot of thimble shape, I shows theoutwardly flaring side wall of generally circular contour, and 2 showsthe bottom of the pot which is preferably rounded or spheroidal inshape.

In order to accommodate a yoke (not shown) whereby the pot may bemounted on a slag car, the wall I is provided with a plurality of seats3 which 10 rest'u'pon the yoke, and projections 4 which accommodatemeans for securing the pot to the yoke I The pot is also provided witheyes 5 whereby the pot may be transferred by means of a crane to 15 andfrom the slag car.

The wall I contains a plurality of inwardly extending corrugations 6disposed vertically around the circumference of the pot. Thesecorrugations begin at a point I somewhat above the bottom of 20 the slagpot and terminate at a point 8 somewhat below the top of the pot. Thesecorrugations preferably increase in depth from their points of beginningI and 8 to a maximum at point 9 intermediate the ends, but my inventionis not in- 25 tended to be limited by this feature, since the spirit ofmy invention will be met by the use of corrugations of equal depththroughout their lengths.

In addition to the inwardly extending cor- 30 rugations 6, abovedescribed, the top of the pot is provided with a plurality of outwardlyextending vertical corrugations I0 disposed between the inwardlyextending corrugations 6 and having a maximum depth at point I I on therim of the 5 pot and terminating at point I2 intermediate the top andthe bottom of the pot.

As heretofore stated, slag pots of ordinary design frequently crack inservice because of the expansion of the walls of the pot resulting fromthe 40 intense heat of the molten slag contained in the pot. Moreover,such pots tend to become bellied immediately below the supporting yokeon which the pot is mounted in the slag car, with the resultshereinabove described. It will be seen 45 that with my arrangement ofcorrugation there is provided the greatest number of corrugations at theportion of the pot subject to the highest temperatures.

With a slag pot constructed in accordance with 50 my invention, however,these results do not follow. The inwardly extending corrugations 6 andthe outwardly extending corrugations I0 act as stiffening members whichreinforce the wall I and tend to prevent the bellying of the wall. 55

Moreover, in my preferred construction the corrugations 6 have theirmaximum depth and consequently their maximum strength at the point wherethe maximum deformation of the pot usually occurs.

In addition, the corrugations 6 and I permit the metal of the pot toexpand freely under the influence of theheat of the molten slag and tocontractfreely when such heat is'removed. with the result that crackingof the walls" due to stresses set up by such expansion and contractionis prevented or greatly lessened. Since a pot constructed in accordancewith-- my invention will not belly, no difiiculty is found in removingthe skull ofrcogled" slag which v flaring sidef wallsm ontaining aplurality of in-' formed if the slag is allowedto" remain in the pot fora considerable time. I

. It will be seen moreover that the, inwardly ieXr-Il tending ribs 6facilitate the removal of any skull, which may be formed on the interiorof the pot since by reason; of their increasing depth from theirpoin'tof inception! to their point of maximum depth v9 they formbearings upon which the skull .is supported-as, it slides from the pot,and lessen. the friction which results from the contact between theskull and the interior wall of thepot. v l U Having thus describedhmyinvention, What I claim and, desire to secure by Letters Patent is:

1. A ladlecomprising a shellhaving outwardly fiaringside" walls, saidside walls containing a plurality of inward y .extending corrugationshaving their'greatest depth intermediate the ends; thereof, and a,plurality of j outwardly extending corrugations at the upper endthereof.

2. A ladle comprising an outwardly ivfla ring substantially circularshell, said shell containing containing a plurality of inwardlyextending corr'ugati'ons intermediate the top and the bottom thereofvarying in depth from their ends to points Hintermediatetheir ends, anda plurality of outwardly extending corrugations at the top thereofincreasing in depth from their lower to their upper ends. g 4. Aladlecomprising a shell having outwardly Wardly disposedcorrugationsextending upwardly to a point below the rim of the shell and a pluralityofjoutwardly disposed corrugations extending-upwardly from a point belowthe rim of the shell to said rim.

5. A ladle havingasubstantially vertical wall providedwith a; firstseries of corrugation extending up the wall from near the bottom of thewall and terminating short of the top of the wall, and a second seriesof corrugation extendingdown-the wall from near the top of the wall andwallfromnear'the bottomof the wall and terminating short of the top ofthe wall, and a second corrugation.; extenc ling down the wall from nearthe top-thereof to; a pointbeyond the pointof termination of the firstmentioned corrugation.

ROBERTS. A. DOUGHERTY.

